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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '80ff40cf6c875e6c4fb484da3ec5ee17e08710cb8cad3591b9a6f14d6a3e87a0' 
  AND token = 'BAM4CACL52v7DwC3EmaIiJjiZGI9ZeBEH6hqq9D8G8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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