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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aea68c362500f200ed0010e330201bd2eada15396b554ba9ac484a516c2c4a35' 
  AND token = 'jFXMq0klIU3u3yfWZMv8XVrKakC/HFoLf4/DmgftBck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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