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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9700ea271665303d0230f5b23e109807671206920c61e5eec2396d15f12c4f8' 
  AND token = 'ngfn8gLGgIM4h1zFZE4oYITl2lesj07xl7x9LtAbDGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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