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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '761fb5827d23c12df75776434af7527942e3c15964e97a8fe42e1e0c85218e5c' 
  AND token = 'AkLVtL9Yig3Od/SECF4t1STWEauzXzehu5lsaC0SaxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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