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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c01dbc73ad0a41ba72df6c11a3d27b35e6bbeaa58e0728eda03ef8042ee21f5f' 
  AND token = 'mpV0UNWw3e02Mhv9oWsQ3LTlnL29IYjeDSqyVPcMsnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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