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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c0cbddabd63fc5fdb254501e3cbe690e22a48fe8b5a1232703679cfab4e869c' 
  AND token = '6vrQJt1VVBoWKgKHumSoMtEQDcZmBZaDM9Smt/DKE70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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