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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '390608cc6438e784175407009c900300159cae2beadfb22df27ba35001970ac2' 
  AND token = 'lZ0Gbh7P+Z+9b5WPoSq75PsWcCQ5n2J30RB/4wN1a04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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