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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '966cf42c74a5514c3150ed70c9668bc91c6d1553a91d102248e200995c9c2756' 
  AND token = 'TtYabU1eb2e+fK7mtiagkT7j5rN3ujrZj+A5V2Mcchw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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