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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b3301ca587f6d4e7cd0ef4df75bffa97a30d693cf81e4a8ed22ece5e847e94e' 
  AND token = '0jMA1CqrMBs/w6oYx4Tkf4jTS/ZgTODM2kCldWfbcDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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