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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1977b6683d97a5b13fa2006c510af7009f275a60e64efcf76b50f12a1e296ba4' 
  AND token = '4H8e3L7owDvFEty/ehbI8p4czE4mfqkhuUCv0+9JCbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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