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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2b4cd37383c091b9efa0a4ecfe81b395f26c68e4fe5e48251c0559f738fe1b0' 
  AND token = 'cH+U/THmhRJ/+k5ykF+RYEp7UaJWOf3Odbrn9E+6M6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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