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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce3aa83d02a545aa3db2d5ac3e5f67bcbfdad9c5f3307fab3a4bece051b6c315' 
  AND token = '9RLSdj7n03w19E6hhuLxq62+u6T3BEtggQGzP4e5Uak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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