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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7990fcda946e25c522e6ff6b736a3a36d35975b7e86e9ecbe2035af72aec0a93' 
  AND token = '3uoH7+KmLcs6Yj5TSwBbJjTJU7ySM42STTxz2W1cWVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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