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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '750a6bd9039e7b7f40ed47706133764013e614bb327fded6374ff46c1141a978' 
  AND token = 'ut7EFO5zEt/HiQVUQEzSXh5cLKebE8td/y14Q8B5LFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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