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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc783974d87b6e7e07b6329953f032b7f1f10cb532b81089a28e33716f717906' 
  AND token = '9ql2z8dYU1bIeM/q490gTAfDd+L6gIyzQYGSN5wakkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}