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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '799d600347f374c3a7ba17eef183106e61bf536c044193f5021f18e5810f8a8d' 
  AND token = 'whGXA+OEwOj+R0o7QfHGpAwNyiHSPvF3Ssu+Nw08GE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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