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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02119bd52c11ef6524a1307f0c8269281ba49b013c74185402bf6292ca571a2d' 
  AND token = '19v0ISe4YwEwO/gNjcMbQ00P2mrhOvl6l2vp4GnhhDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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