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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2013d580d838526efa5f55862574d57976b1de6b7087ab4afb15b13fe4ebc1e0' 
  AND token = 'ZUeqCcCP+3eImACkv1M6aoQ7UxfyJm03UlaiLX6KuuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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