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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31f939cfa71086105a2588afd815b294ed883e08dd5d4921ae385b7b6ed0aedc' 
  AND token = '+4kH4DXOZzTbD4Mqcb8hBAKkFdUg4UtLkiNn2RQ8AaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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