SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb743fb2e8321e006b00cefb16027fe5a506d04d2d933060487bdb2abe355147' 
  AND token = 'BC2JAVKdzU/ZWtvyFv8l98H+R3KuWwL7xfQVgmN7F0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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