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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb469a4f4e273f593e6b25910c1061c0234cce5938c37e21030e4013212548b4' 
  AND token = 'kMMdnLURDyEmkNtU+eoTYsDG0VljFvBZe+UbftMqTVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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