SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f60c5d75e9684316d3ba402ed6b683548b567855e79986cdba8e08e794978469' 
  AND token = 'rUkEMBLM4GGUS+1hgRcZDTMfbsFRXuwh/ClJ+DjjUNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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