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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e11b1bfc69a384dc9c8a76d93664ab2d89521c5c77479694ce2744af106ff7c2' 
  AND token = 'b0zUaSJ3UZxxYHxTZNNT7WUUH0hIvPhnh39vTlLGivE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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