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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0aa913d10cbc6848577a6431757feb38c319647e8a3080ce29746445ea45521' 
  AND token = 'flmdi261pCv3DSQkh6xxIgaQ092q10pKrxRDrrUN/2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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