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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15ffea15bf3d2f83efbc4f83e678d16f657f2c6acdcc11c49f247884fe84daed' 
  AND token = 'AW/rWI65+NbWYiccYaWQoM03Mm+T/ccnPs7Ce5rlrBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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