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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc4217581e3c4b477d01f1bd1aad5bc9da57f3a2291c451610d9b0126cd6de7e' 
  AND token = '5ALXNfM7pcX/08FcSRyfmW35TfrABrNsXtA8ncysLk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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