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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15ea2ca8a18c7858f38e2bb207fcccd8e9da3a238ab963e19e5cd18d4bfd04c5' 
  AND token = 'CSaol8GWCjPOSiQSfypY2dLtr5324YNhJ6lWJGP/1FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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