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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '345f638d0bdd5e5e26633b10ec1896041c1e761d8404c208f076889f14899663' 
  AND token = 'SyuIjnVpTiJtedaS8Pn25yWuP6imaO7pOyqEW6+SxIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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