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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2697535aa91dcec50ac8c16ae7216253f62516c3dba516afc05237096045ed40' 
  AND token = '57gSydIbmLRVU0tVLSAg9iEPM0pMf/9JnQKUs3p23dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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