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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3fb6b2d7cb4aaacd3185fa5bab1dcb9233a00fd08db3237690152d6a5a709ef0' 
  AND token = 'WMLp0HBnpFGaS1iCWp+18mwxMfP8XH3/UulwSvnOw2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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