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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '046324e1d3c8ef7a1cafb7ddca49771b4ac8a23abb22daab6bf8ebea99f2b2d8' 
  AND token = 'cZv62dsVUU78xCvWWO+mXNDheTaNOOewBPJi9/pJC/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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