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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c27016a4907e17ad13d969eafc9b71be3ddbde02c78bf09772ef01247dd3c16' 
  AND token = 'EUGEIt86isAdGXaQhrA2uNkcitmKt4usvG8GU7Lbb1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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