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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd082243525383d7077dd7c8916b4e7b3ff6a6cde47b07d2bc42cba32a899ae5f' 
  AND token = 'EhM2VcrhftoEu+YTRxTxMTIv+ogEvBeFeghRpM/SQ3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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