SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa4880a725601b3e1aa2a9b97851b6bce9dd617958310dbeb3981349c3734548' 
  AND token = '5YVFhuM6T6Ud0XX/gGOfxIYNiRlsa9t2z1GqFRZBO4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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