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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '081cc2fd9c2f9fe77e778a2444db7c647e3280de41e6f3fe7228b3e8e16924fb' 
  AND token = 'Yv1/E6pG/qfv8iYxfllcQF9LBw68GyEAGYInKqw2LZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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