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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30dc478aa0304976e59bcc4b9596b4a32b884b6e0db9b0103237e7890ba57aca' 
  AND token = 'X5AOKePIBW44DE3EJXwFUPEDJlsF5clKo7y/o4hX1us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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