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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '907cc25bf89549ae343e98882b06909ef1c2e469197c715e676d869de7266a2d' 
  AND token = '7LC86v6E5dkqMaYo7dkSUd12TbM0QdnakNL31QG+7CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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