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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20478b02bf78c9169dd1475178dec653a8f8092a77ba251ddf08613b9298a08a' 
  AND token = '8xPVY4Hk8tLPqWZmitK0RI31pCPdfUhq2UY7qj4hFa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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