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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '630b40bec8ea073b1a17244150fba605192a96113ec39df344ae1833d2316463' 
  AND token = '2Z4knaXienrMlkJuWG9GruhVC+nZnAzlmonEuTvWjkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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