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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '879676b5cc5dfdff78eb8c53827a4dca2c38ee79edfce1f57ddb6cef4debd1f4' 
  AND token = 'akB6Tl28L6sxqbpG/DjE1yk5dzdtawh5T3XAeGFv3ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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