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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2c7a5f4276a357a4b69f120379464202b6b714e5c16d9adf910020a0eec19a9' 
  AND token = 'y7VhZQ7FN5LalonPVpa15wiPtZOk2qpGhko493yiOXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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