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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cd3f3a51a829a3b0f3e21e159042dc1b5fc26974d9d7de62b1d393ff096db8a' 
  AND token = '3OIDPZtqmDwbFckXbp1ZtbpnfGcW9tMptQbShr7i6Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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