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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7253048da19c5687ba8acce398917790855ea5ff4bc04d7524fc92da8ad91202' 
  AND token = 'kGzgeAcNJVxrxh6CTTdehGabWMf/dV64Qdpiq0/UpIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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