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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c81aaa0abcd0574d09b05878be575ca76042e8b024aa901a956722cd44946057' 
  AND token = 'ts6Wpu5Qv7K+7yiYiWFGRh19AAm2O8yT5XUrnT56YDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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