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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19dfe18b1d14fc91443588987317d938d2d5f4c35eb33b8064a90a9999922974' 
  AND token = 'CZUzshN/7tWG8SLWbiQS/AtyQZFT/SfofsIl/fkBE/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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