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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2cbd879d70bd87d85e32b5a211d0d39752ab5e87c583c4a8f72eee14eb55c30' 
  AND token = 'n/na8FkC63HiPwxVHQE1IYRNEOIxEUmcK/w/PKSWza4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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