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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '373d4fc18f7cca0b723e57aa7d9bca146d6b4eeec0769efe85d0155207b0bf5c' 
  AND token = '5k97mCz6LfLLIIW2MRyg7zrTVoGf9PfbEBLL17tbISI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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