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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2079961d9998d854a1bcba057d7293be87e8ac16b682b1bf05f74abe8f22220' 
  AND token = '//FTtHs8q0L7j2UU/UCwnKxwcndeL/t02phvXMdN/B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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