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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7a7f527ae69da0bd55df808b3f241c6ee93e573e15e8648fc263c249d9f31a8' 
  AND token = 'sGhFsPdWttRMyq7QJChO6/+T7Cap8LlAZRQW/6Npb7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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