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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f821887b72542cfa71b802717b615f78a5b4146fe71a5ffea501f70c7567dcb' 
  AND token = 'hjWHXwsmmW8Beh1S6R4kNCykVZ424VSGSa39vKfP7sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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