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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38a94f0b9855dda7ea10f697eb37fcbb99c66ccb38fecd8d323bee13dada037e' 
  AND token = 'kqY3PYNGpn0OaNZE9kEQQ9vWvutkNwPN9widj6atb9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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