SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b971f6d5f4aa6f38abee6f4d69d02080728611ffc5932eb7599883d2e46847f' 
  AND token = 'pSL9ksig3mZFZbevH7WjJqTuwzLrBh1pHW0LX8CiS2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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