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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11e05e77fa7bab21b59aa8ddbd0362c1b46245430650d638f5c298fdf1663b05' 
  AND token = 'gkkC5Xcpd5i1gnWxRE2/rfcR5B0BU5X1433NXdBzwnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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