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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5ed924fc156c1d4fa85ef9d3febc0fe804b54638b354140f65243fd634e8e08' 
  AND token = 'q7yHSOVhSV9FmUU7Bgj72Ky8z6TkI8SkAE8Pa+gvaeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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