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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e313179146b24b9a2e2b833995880f2d0e5dbbe24e47c5ce9d96d734a29bfcac' 
  AND token = 'TRG/291g2RZJXoPZL/pnlYIc1lrwqiydGOZ2vau+r2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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