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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86e55652f7342719029780cc02073aa4e4eb906973264d2805d1dd515622246b' 
  AND token = 'MARoILuxVpFqOnerBIsUoC91dxbzZ0c8DiVcmDuOQUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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