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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b914b422a1a241b317921fea700ab1fe08e4cd6a5e5f13820f5d47e32c87a12' 
  AND token = 'nL0z9WYMKUQBXu76X4PUKlAHmYHlRn2vMWQUn7coHvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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