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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62893081411f533fbe6bd0bcfb03ba75868926fd600f1034976a7b69e3252c3b' 
  AND token = '2ZeS4Hi2c9OPge063XLdSlO8b/3F8LzAkUI8vtbk6zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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