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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea7800526129f66c2fab44dba8f72b0f431979a14598940543bccab217b34204' 
  AND token = 'Pama2apDAL8xwHOM5k7T8oXMI7UlU36yXNZN71bfEs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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