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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fbf87a994a2e86eb026f1893ba40424a310f6344bd3f21066d5773b98925b3fa' 
  AND token = 'ok1mHTyXrbeopk2eRp8WH6hJtOD8NkmhmEpUSbhryYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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