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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b2f0c4a8db62d170f76c223a3fcb7704cb812c33bb5bf8cc7d2c5ecdee48b6f' 
  AND token = 'KCNSdT+p2uFVhTUUC6xHKRelq95A0L8afORO74jB9wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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