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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd683914d9c4206cb8e9b100307a63fed8c48d5db6beaa500fc938acd6e30c8d5' 
  AND token = 'iRg/e3FQYP0OH81NVawIuP7jVO4oXz5T6wFurQdCa7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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